package com.alibaba.alink.common.linalg.jama;class Maths {	/**	 * Sqrt(a^2 + b^2) without under/overflow.	 **/	public static double hypot(double a, double b) {		double r;		if (Math.abs(a) > Math.abs(b)) {			r = b / a;			r = Math.abs(a) * Math.sqrt(1 + r * r);		} else if (b != 0) {			r = a / b;			r = Math.abs(b) * Math.sqrt(1 + r * r);		} else {			r = 0.0;		}		return r;	}}